Lot 41239 – 1919 (May 18) Hawker & Grieve 1919 (May 17) Env

1919 (May 18) Hawker & Grieve 1919 (May 17) Envelope with 1919 3c Caribou and Great Britain KGV 1 1/2d tied by mute cancels, with Post Master General’s oval ds adjacent, reverse with London “Found open and officially sealed” label with London cds, incl. original contents “H. G. Hawker is making this attempt on a Sopwith biplane (Rolls Royce engine)…”, fine and rare